cornett



Jan. 24, 1956 w. v. coRNETT 2,732,197

PORTABLE POWER HAMMERS Filed June 26, 1952 3 Sheets-Sheet l WALTERCORNETT BY ATTORNEYS Jan. 24, 1956 w. v. coRNETT 2,732,197

PORTABLE POWER HAMMERS Filed June 26, 1952 3 Sheets-Sheet 2 JNVENToR.

WALTER V. CORNETT ATTORNEYS Jan. 24, 1956 w. v. CORNETT 2,732,197

PORTABLE POWER HAMMERS Filed June 26, 1952 3 Sheets-Sheet 3 TJE CINVENToR.

WALTER V. CORNETT BYMM ATTORNEYS `of theA inventionV are disclosed.'however, that these are illustrative, not limitative, as many UnitedStates Patent() PORTABLE POWER HAMMERS Walter V. Comett, Los ngeles,Calif.

Application June 26, 1952, Serial No. 295,784

6 Claims. (Cl. 262-15) This invention relates to a portable power hammerdevice having a pneumatic tool generally usable for demolition work suchas breaking concrete, asphalt and other paving, cutting trench in anypavement or road and tamping backll, where the device is towed fromplace to place. Hereinafter where the term a device of the characterdescribed is used, it will be understood to refer generally to such adevice.

An object of the invention is to provide a device of the characterdescribed particularly adapted to what is commonly called deep trenchingas distinguished from demolition work on road surfaces or the like. Suchdeep trenching requires a device in which the hammer tool may be loweredto the bottom of a deep trench-not only to cut the trench but tosecurely tamp the backll in layers as the trench is filled. The worksurface therefore may be either the road surface on which the wheels ofthe device are supported, or it may be the surface in a trench below theroad surface.

Another object is to provide a device of the character described adaptedto straddle a trench or a work surface, the tool or hammer beingsupported on a carriage that is movable along the framework andtransverse the work surface.

Another object is to provide a device of the character described`wherein motors are provided for moving the carriage supporting the tooland for moving the tool vertically to adjust the latter to operate intrenches of various depths.

Another object is to provide a device of the character described whichmay be provided with sets of wheels at each end of the platform, atleast some of these wheels being swivelled to permit turning them on avertical axis so that their axis of revolution is transverse thelongitudinal axis of the platform to permit the latter to lie across atrench and the platform moved Athereover in a path parallel to thetrench.

Another object is to provide a device of the character described whereinthe device can be coupled to a truck or other vehicle and towed therebywhile projecting at an angle to the path of travel of the truck.

A further object is to provide controls for the various pieces ofapparatus comprising the device, that are all within easy reach of anvoperator seated upon the movable carriage carrying the tool.

Other objects and advantages will be apparent from a perusal of thefollowing specification andA drawings where-by way ofillustration-preferred embodiments It will be understood,

changes can be made without departing from the spirit of the inventionas defined in the appended claims.

In the accompanying drawings: Figure l is a side view of the deviceconstituting this invention, having its front end supported on a truck;Figure 2 is a plan view of the device, Figure 1; Figure 3 is an end viewpartly in section of the rear wheels of the device, Figure 1;

Figure 4 is a top view, partly in section, of the cylinder head of thetool used in the device, Figure 1;

Figure 5 is a plan view of an alternate wheel arrangement for thedevice, Figure 1; and

Figure 6 is an end view of the front wheel unit used in the device,Figure 5.

Referring to Figures 1 and 2, a platform'generally denoted by thenumeral 10 is constructed in any suitable manner to form an openframework. This may have the side members 11, 12, united at their endsin any suitable manner as by plates or cross members 13, 14, to form aframe-like structure open as shown at 15.

Mounted upon the platform 10 is a carriage 16 constructed in anysuitable manner, and the same constitutes a second frame-like structureand is supported on the platform by rollers along its sides; two of saidrollers are shown at 17, 18, and these may run on the upper surfaces 19,2), of the I-beam side members 11, 12, of frame work 10.

The carriage has depending from the side members thereof on each side,the downwardly depending arms, one of which is shown at 21 which carryat their lower ends rollers 22 which extend under the at surfaces 23,24, of the I-beams or rails 11, 12, and serve to hold the carriage downon the rails during operation.

Rollers 25, 26, are provided attached to theside members of the carriage16 and bear against the outer edges 27, 28, of the rails to preventlateral displacement of the carriage thereon.

It will be noted that carriage 16 may now ride on rails 11, 12,longitudinally of the platform 10.

A suitable motor 29 (for example, anV air motor) is connected to awinding drum 30 about which `is`wound a cable 31 the ends of which aresecured to the ends 13, 14, of the platform. When motor 29 is operated,it will pull carriage 16 toward the front end 13 of the platform, and ifthe motor is reversed by using control handle 32 the carriage will bemoved to the rear end 14 of the platform and by proper manipulation ofthe control 32 the carriage and tool carried thereby may be made toassume any position intermediate the ends of the platform 10.

Secured to the carriage 16 are a pair of trunnion blocks, one of Whichis shown at 33, the other is on the opposite side of the carriage.Supported to turn freely in these blocks are the trunnion shafts V34,35, securedV to these shafts and extending upwardly therefrom are theguide members 36, 37, and secured to the guides are latches 38, 39,which by means of control handle may be brought into engagement withslots 41 in guide rods v Secured to guide rods 42, 43, is a suitablehammer mechanism having a cylinder 44 having an upper head 45. In thecenter of this head is a boss 46 to which a cable 47 is attached andwhich extends to a winding drum 43 connected to a suitable air motor 49.This has a control 50 by which the motor can be started, stopped andreversed. A second control or let-off is provided for releasing cable 47if desired.

The cylinder 44 contains the usual piston, and depend- I ing therefromis piston rod 52 which carries a suitable tool 53 depending upon thetype of work to be done. The tool 53 shown is suitable for tarnpingbackll in trench 54.

lt will be seen that by operating motor 49 that the entire hammer toolassembly and its guide rods 42, 43, may be raised and lowered, therebypermitting the tool 53 to be lowered into trench S4 to tamp backlill inlayers as desired, and to vary the stroke of the hammer. The hammerassembly can be locked in any adjusted position by the locking meansdescribed in connection with Figure 4. For further details of the hammerassembly per se, and particularly the above described locking mechanism,ref- 3 eren'ce is made lto my co-pending applications Serial No. 33,603,filed June 17, 1948, now Patent Number 2,672,- 331 and Serial No.104,569 filed July 13, 1949, now abandoned.

During transportation, it is desirable to lower the hammer assembly,which is accomplished by disconnecting stay rod 55 yat 56, and swingingthe hammer unit about trunnions 33, 34, and locking rod 55 at 57.. Thislowers the .hammer unit to the position shown in broken lines at 58. Thetool 53 may be held in idle position by chain '59.

A seat 60 is mounted on carriage 16 in such a position that an operatorseated thereon can manipulate control 32 for the carriage motor controls50, 51, for the hammer lift, locking control '50, and the air valvecontrol 61 for reciprocating the hammer.

A pipe 62 connects to the hammer Vcylinder via valve 61, to the airmotor 29 via control 32 and to motor 49 `Via control 50. Pipe 62 mayconnect to a suitable compressor 63 carried on truck 64, or thecompressor may be mounted on carriage 16 or framework 10.

The platform 10 must be supported in such a manner that while positionedtransverse the Work surface-for example, trench S4-it can be moved alongthe trench. This is accomplished by providing the rear end c-f theplatform with a plate 65, Figure 3, having a downwardly dependingportion to receive swivel pin 66 which rockably mounts the platform onthe axle plate 67 secured to axle 68.

Axle 68 carries two wheel forks; as both are alike, only one will bedescribed. Referring to Figure 3, the fork has an upwardly extendingshaft 70 which permits the fork carrying wheel 71 to be revolved aboutthe axis of shaft 70, which when properly adjusted is locked to the axleby nut 72 or in any other .suitable manner. The same can be accomplishedwith the right hand fork 73 and its wheel 74. The wheels are preferablyequipped with pneumatic tires.

When being towed from place to place, wheels 71, 74, are locked inposition shown in broken lines, Figure 2. When the device is inoperation, the wheels 71, 74, are locked in the position shown in solidlines at the left, Figure 2, and tie rod 75 extends from axle plate 67to the bracket 76 on truck 64 so that when the truck goes forward orback, the platform 10 and all parts mounted thereon are moved along andover the work surface in a manner that will be obvious, the front end ofthe platform 10 being supported on the truck in any suitable manner.

Referring to Figure 1, one way of combining the device with a truck isshown. Here the front end 13 of the platform 10 is provided with abearing plate 76 provided with a downwardly depending portion 77 holdingthe pivot pin 78 which .is journalled to turn in the axle support 79secured to the axle carrying the usual rear wheels 80, 81. truck 64 andwill track after the truck as it is free to turn about the axis of thepin 78.

An alternate method of providing wheels for the device is shown inFigures and 6. Referring to Figure 5, the platform is provided with-swivelling rear wheels 71, 74, as heretofore described, but the frontend thereof is provided with the wheels and axle shown in Figure 6 where82 denotes an axle carrying wheels 83, 84, mounted in forks andadjustable in the axle like .the lwheels 71, 74, of Figure 3. The pin78, member 77 and plate 76 are the same as previously described.

It will be noted that in this modification (Figures 5 and 6) all wheelsare adjustable to permit them to travel in The device can, therefore, betowed by paths transverse the longitudinal axis of the device, orparallel thereto, as shown in dotted lines 85, Figure 5.

When the device, Figure 5, is used, a towing cable 86 may be attached tothe device for towing same over thc work surface. When moving the devicefrom place to place, this cable is attached to the lug 87, or said lugmay extend outwardly to form a pulling tongue or bar by which the devicemay be towed from place to place.

Details of the piping connecting the cylinder 44, and control valve 61therefor, the motor 29 and control valve 32 therefor, motor 49 andcontrol valve S0 therefor, all connected to the air supply 62 are notshown in detail as they are obvious. However, reference is made to theaforesaid co-pending applications for details of the control valve 61for the air cylinder 44. The air supply pipe 62 connects to motors 29and 49 via their associated valves 32 and 50 in the usual manner.

What is claimed is:

1. In a truck driven portable power hammer device having a pneumatictool for impact breaking and tarnping work on roadways .and backiills, atrailer consisting of a pair of spaced parallel longitudinally extendingrails, a swiveled hitch connection fixed to one end of said rails, acarriage movably mounted on said rails adaptable for axial adjustmentalong the length of said trailer, land supporting said pneumatic toolbetween said rails, an axle supporting the other end of said rails, aroad wheel swivelly mounted under each end of said axle adaptable foreither normally longitudinally adjustment for transportation from placeto place, or transverse alignment normal to the longitudinal axis ofthetrailer for straddling operation over trenches yand roadways to one sideof said truck, and a link adaptable for bitching said axle to the sideof said truck for such straddling operation.

2. The combination defined in claim 1, and a pneumatic motor andcontrols therefor on said carriage for said axial movement of saidcarriage along said rails.

3. The combination defined in claim 2, and means for vertical adjustmentof said pneumatic tool on said carriage for varying the level ofoperation of said tool with respect to the adjacent ground.

4. The combination defined in claim 3, said means including a pneumaticmotor and controls therefor on said carriage.

5. The combination defined in claim 4, said pneumatic tool being mountedon transverse horizontal trunnions on said carriage, and a linkadaptable for fixing the upper end of said pneumatic tool, in a tiltedposition, to the front end of said trailer for holding its lower end offthe ground during transportation of the trailer from place to place.

6. The combination of claim l, another axle and similar road wheelsconnected under said swivelled hitch connection, .and having a draw baradapted for coupling to the rear of said truck.

References Cited in the lfile of this patent UNITED STATES PATENTS1,130,007 Nagle Mar. 2, 1915 1,140,461 Jennings May 25, 1915 1,180,562Beggs Apr. 25, 1916 1,541,392 Reaney June 9, 1925 1,830,752 Cornett Nov.10, 1931 2,162,553 Hirschberg June 13, 1939 2,180,621 Thomason Nov. 21,1939 2,338,056 Penote Dec. 28, 1943 2,532,164 Hansen et al Nov. 28, 19502,603,008 Bennett July 15, 1952

